<!DOCTYPE html>
<html lang="en" xmlns:th="http://www.thymleaf.org">
<head>
    <meta charset="UTF-8">
    <title>邮件示例</title>
</head>
<body>
    <h1>欢迎你, <span syle="color:red;" th:text="${username}"></span></h1>
</body>
</html>